US 3477452 A
Description (OCR text may contain errors)
Nov. 11, 1969 A. MOHAMED 3,477,452
APPARATUS FOR CIRCULATING HEATED CLEANING SOLVENT wrmouen ENGINES Filed Feb. 21, 1967 INVENTOR.
AT'IORNEYS United States Patent 3,477,452 APPARATUS FOR CIRCULATING HEATED CLEAN. ING SOLVENT THROUGH ENGINES Ahmed Mohamed, 6549 Landis Ave., Carmichael, Calif. 95608 Filed Feb. 21, 1967, Ser. No. 617,531 Int. Cl. B08b 3/00, 9/06 US. Cl. 134-57 1 Claim ABSTRACT OF THE DISCLOSURE This invention constitutes an improvement over my Patent No. 3,148,549, issued Sept. 15, 1964, the relevant disclosure of which is incorporated herein by reference. My previous patent disclosed an auxiliary engine and interconnected drive means for driving an engine, such as a diesel engine, while the engine was being cleaned by passing solvent therethrough. The present invention is directed to means for circulating the fluid and is intended for use in connection with the invention described in the foregoing patent and with similar apparatus.
This invention comprises means for withdrawing cleaning fluid from an engine, recirculating the cleaning fluid by pumping it through a filter and a heat exchanger back to the engine which is being cleaned. A particularly important facet of the present invention is the provision of a novel heat exchanger in which the heat exhausted from an auxiliary engine which is used to rotate the engine being cleaned is used to preheat the cleaning solvent before it is passed into the engine. Another particularly important facet of the invention is the provision of temperature control means which sense the temperature of the fluid entering the engine and control the rate of flow of exhaust through the heat exchanger to control the temperature of the cleaning fluid.
The drawing discloses the system of this invention for circulating cleaning fluid in partial schematic form.
Frequently it is desirable to thoroughly clean the internal working parts of internal combustion engines. Particularly this is true of diesel engines and stationary engines which are subject to heavy loads for long periods of time. After a period of running, internal combustion engines build up a layer of varnish, carbon, and gum upon the operating parts and collect a large amount of sludge in the lower parts of the engine. Other foreign deposits, such as metal particles, and foreign particles which enter the engine frequently collect in the crankcase or in the engine at other points. Such deposits are known to decrease the efliciency of such engines.
Such deposits may be removed from an engine, such as engine 10 which has an oil inlet 12, a crankcase 14 with an oil outlet 16 and a carburetor 18. Such undesirable deposits may be removed by circulating cleaning fluid through the engine and removing it through a conduit, such as conduit 20, which in the preferred embodiment, leads to a pump 22 which is driven by an electric motor 24 which receives power through a switch 26, and lines 28, from a battery 30 which is powered by an auxiliary engine of the type described in my prior patent. A conduit 32 leads from the output of the pump through a valve 34 to filter 36 which may be of a conventional Patented Nov. 11, 1969 type. A conduit 38 leads to a heat exchanger 40 which will be described in greater detail hereinafter. Conduit 42 leads to a temperature sensing device 44 and through conduit 46 back to the oil inlet 12 of engine 10. Thus it is seen that a continuous path is completed through the engine for continuously circulating cleaning fluid through the engine to remove varnish and sludge deposits and the like.
An important feature of the invention is the provision of a heat exchanger in the conduit system and particularly a novel heat exchanger which uses the heat of exhausts from an auxiliary engine. Such a heat exchanger is shown at 40 and includes a liquid receptacle having inlet and outlet openings which communicate with conduit 38 and with conduit 42. An exhaust pipe 48 extends from the auxiliary engine 50, as described in complete detail in my prior patent, through the liquid receptacle and thence to atmosphere. Thus the exhaust from the auxiliary engine 50 is transferred to the liquid cleaning solvent prior to its introduction into engine 12.
Valve means 52 may be provided in the exhaust pipe at a convenient point, such as is shown in the figure, and is connected by a flexible operating means 54 to the temperature sensing device 44. The valve means 52 is controlled by the temperature sensing means 44 for controlling the rate of passage of exhaust through the heat exchanger and the temperature of the liquid in the heat exchanger.
In one embodiment of the invention, an auxiliary exhaust pipe 56 may be provided prior to the connection of the exhaust pipe 48 with the heat exchanger. A valve 58 may be provided in the auxiliary exhaust pipe which may be controlled by a temperature sensor 60 to decrease the amount of exhaust flowing through the heat exchanger. Valve 58 may also be sensitive to the pressure fluctuations resulting from operation of valve 52 to that excess exhaust to atmosphere.
It will be seen, then, that the apparatus described provides means including a first conduit 20', a pump 22, a second conduit 32, a filter 36, a third conduit 38, heat exchanger 40, and a fourth conduit 42 and 46 for recirculating cleaning fluid through an engine.
A method has also been described which is carried out by the system of this invention. In carrying out the method, the engine is driven by auxiliary motor 50 which may be of any conventional type and the drive means may be of the types known in the prior art, such as those disclosed in my prior :patent. Simultaneously with the operation of the engine, cleaning fluid is continuously passed through the engine. The cleaning fluid is heated prior to its entry into the engine. The cleaning fluid is preferably heated to a temperature above 200 F. and preferably in the range of from 200 F. to 250 F. While the method is most advantageously carried out by the present invention, it may be carried out using other equipment. For example, a stationary engine may be hand cranked or may be cranked by any conventional driving means. The recirculation may be carried out by hand by catch ing the exiting cleaning fluid and pouring it in at the top of the engine.
While the invention has been disclosed in considerable detail and with reference to specific embodiments and the abstract of the disclosure is drawn in very specific terms, it should be understood that the disclosure and the abstract are intended to assist those skilled in the art to apply the invention and are not intended in a limiting sense. It will, therefore, be understood that many variations from the exact embodiment disclosed may be made without departing from the invention hereof. For example, the provision of a filter prior to the pump would be an obvious and equivalent system. Similarly, a heat exchanger could be placed in the system prior to the pump.
Both of these generally equivalent constructions may be used, but the present arrangement of components has been found most advantageous and is considered the preferred embodiment of the invention.
1. In a system for circulating a cleaning fluid through a first internal combustion engine having a crankcase provided with an oil outlet and a spaced oil inlet, said system comprising a series fluid circuit including:
a fluid pump having inlet and outlet sides;
a a first conduit connecting said crankcase oil outlet with the inlet side of said fluid pump;
a fluid flow first control valve having inlet and outlet sides;
a second conduit connecting said outlet side of said pump With the inlet side of said first valve control;
filter means having fluid inlet and outlet sides;
a third conduit connecting the outlet side of said first control valve with the inlet side of said filter means;
a heat exchange device including a receptacle having spaced inlet and outlet openings;
a fourth conduit connecting the outlet side of said filter means With the inlet opening of said heat exchange device;
a fifth conduit connecting said outlet opening of said heat exchange device with said first internal com- 'bustion engine oil inlet;
means for generating heat to effect operation of said heat exchange device, said means comprising an auxiliary internal combustion engine having an exhaust pipe;
said exhaust pipe extending through said receptacle and venting externally thereof to the atmosphere;
an exhaust gas control valve disposed in said exhaust pipe;
temperature responsive means connected on said fifth conduit and operably connected with said exhaust gas control valve to control the rate of flow of the exhaust gas from said auxiliary internal combustion engine through said exhaust P p means connecting said auxiliary internal combustion engine in driving-relationship with respect to said first internal combustion engine Wherebyoperation of said auxiliary internal combustion engine and said pump eflects continuous circulation of said cleaning fluid through said series circuit including said first internal combustion engine; an auxiliary exhaust gas pipe having an end thereof connected in open communication with the first mentioned exhaust gas pipe intermediate said first internal combustion engine and said receptacle; valve means disposed in said auxiliary exhaust pipe; and temperature responsive means disposed proximate said first exhaust pipe and operatively connected with said last named valvemeans to control the amount of exhaust gases flowing through said heat exchange device.
References Cited UNITED STATES PATENTS 2,173,554 9/1939 Hill 13423 XR 2,912,990 11/1959 Wilson 134-169 XR 3,148,549 9/1964 Mohamed 134166 XR 3,223,150 12/1965 Tramontini 23712.3 XR
ROBERT L. BLEUTGE, Primary Examiner US. Cl. X.R.